KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 171 



Locality in Gotland: Follingbo; two specimens from Samsugn in Othem. Some 

 weathered arms, No. 129, from Fårö are referred in the collection to this species, but I 

 doubt whether they belong to it. All localities are in bed f. 



Gissocrinus verrucosus, n. sp. 



(Plate X, figs. 352—378.) 



Diagnosis. 



Dorsal Cup regularly conical; height slightly greater than width; ornamented with 

 large granules that vary in arrangement. IBB of moderate height. BB higher than wide. 

 RR higher than wide, faeet rather more than half width of R. IBr 4, sometimes 5. 

 IIBr 4, sometimes 5, rarely 6. Arms branch 4 times at most. Arm-ossicles widen slightly 

 distalwards; change from more than twiee as wide as high in the proximal region to as 

 high as wide in the distal region; they are laterally compressed. Ventral tube vertical; 

 greatly compressed dorso-ventrally; composed of quadrangular plates with a transverse 

 ridge and a slight longitudinal ridge. Stem-ossicles round, very Ioav, the alternate ones 

 with a projecting moniliform rim. 



This species is founded on 10 specimens, all recently collected by Mr Oscar W. 

 Wennersten. They are mostly rather crushed; but those in a yellowish and more marly 

 matrix are less crushed than the rest, which are in a blue-grey matrix. The measure- 

 ments are taken from one of the former, which has been extracted clean from the matrix. 



Description. 



3 #1 _j_ 3 # 9 

 Dorsal Cup regularly conical. Height 8 mm.; width at base x = 3.5 mm.; 



5.1 -f 10.5 

 width above ^— - = 7.8 mm. All the plates are ornamented with large granules; 



these are sometimes quite irregular, sometimes follow the outlines of the plates, and 

 sometimes tend to radiate (contrast tigs. 352 and 361). 



IBB 3; but the sutures are not clearly seen owing to the ornament. 



BB 5; hexagonal, and post. B heptagonal. Height 4 mm.; width below 3.4 mm.; 

 width above 3.6 mm.; length of adjacent sides 2 inni. 



RR 5; high, pentagonal. Height to bottom of facet 3 mm. or 2.25 mm.; width 

 below 4 mm.; width above 4.5 mm.; length of side about 3.25 mm.; width of facet 

 2.25 mm. The facet is sometimes surrounded by a distinct ring of granules; it projects 

 slightly; there is a distinct axial canal in the middle of a transverse ridge (figs. 354 — 362). 



The Arms never appear to have got beyond VBr. Their length in the adult was 

 probably about 26 mm., or rather more than three times the height of the cup. In general 

 appearance they are separate from one another, and rather Cyathocrinus-like in the mode 

 of branching. The axial canal is distinct. As in other species, the ossicles are laterally 

 compressed in the distal region of the arm; this compression is considerable, but not quite 

 so much as observed in G. campanula (tig. 363). 



